Virtual Labs

To simulate interfacing of multiple motors (DC Motor, Servo Motor and Stepper Motor) with Arduino

1. Why is PWM required for DC motor speed control?

a: It increases motor voltage directly. Explanation

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b: It controls average power delivered to the motor. Explanation

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c: It switches motor direction automatically. Explanation

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d: It prevents motor overheating only. Explanation

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2. What is the working principle of a servo motor?

a: It rotates continuously at constant speed. Explanation

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b: It moves to a specific angle based on pulse width. Explanation

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c: It vibrates using high frequency signals. Explanation

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d: It uses analog voltage for angle control. Explanation

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3. How does a stepper motor maintain precise control?

a: By rotating freely without constraints. Explanation

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b: By using continuous analog voltage. Explanation

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c: By moving in fixed incremental steps. Explanation

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d: By adjusting pulses based on sound waves. Explanation

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4. Which example correctly matches a motor with a real-life IoT application?

a: DC motor – smart curtains Explanation

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b: Servo motor – vibration alerts Explanation

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c: Stepper motor – table fan Explanation

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d: Vibration motor – robotic arm joints Explanation

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5. What happens if a wrong pulse sequence is given to a stepper motor?

a: It rotates smoothly but faster. Explanation

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b: It may skip steps or rotate incorrectly. Explanation

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c: It stops working permanently. Explanation

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d: It behaves like a DC motor. Explanation

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6. How do DC motor and servo motor differ in control?

a: Both use angle-based control. Explanation

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b: DC motor uses PWM for speed, servo uses PWM for position. Explanation

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c: Both use serial data for control. Explanation

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d: Servo motors require no PWM. Explanation

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7. Why can’t a typical servo motor rotate full 360°?

a: Because its body is too small. Explanation

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b: Because an internal stop limits rotation. Explanation

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c: Because it has only two wires. Explanation

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d: Because it uses a battery. Explanation

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8. How can the direction of a DC motor be reversed in simulation?

a: By changing PWM duty cycle only. Explanation

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b: By reversing power supply polarity via H-bridge. Explanation

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c: By reducing motor speed to zero. Explanation

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d: By enabling analogRead pins. Explanation

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9. Why are stepper motors commonly used in CNC machines?

a: Because they rotate freely at high speeds. Explanation

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b: Because they provide precise step-by-step movement. Explanation

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c: Because they require no driver circuits. Explanation

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d: Because they consume very low power. Explanation

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10. What is the role of driver circuits in motor control?

a: They reduce motor voltage to zero. Explanation

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b: They deliver high current safely from microcontrollers. Explanation

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c: They replace PWM functions entirely. Explanation

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d: They measure motor temperature only. Explanation

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